Cortex-R5 Software Development
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1 Cortex-R5 Software Development Course Description Cortex-R5 software development is a three days ARM official course. The course goes into great depth, and provides all necessary know-how to develop software for systems based on Cortex-R5 processor. The course covers the processor architecture, memory ordering, memory protection unit (MPU), caches and TCMs, Assembler language, synchronization, barriers, debug, power management, C for ARM and exception handling. At the end of the course the participant will receive a certificate from ARM. Course Duration 3 days
2 Goals 1. Become familiar with ARMv7 architecture 2. Become familiar with Cortex-R5 architecture 3. Become familiar with ARM instruction sets 4. Understand Caches and TCMs structures and maintenance 5. Be able to write assembler code for Cortex-R5 6. Implement synchronization processes using mutex/semaphore 7. Be able to add barriers instructions to control program flow 8. Be able to configure and use the MPU 9. Apply invasive and non-invasive debug techniques 10. Write an efficient C code for Cortex-R5 processor 11. Be familiar with ARM tools for Cortex-R processors 12. Manage Cortex-R4 power modes Target Audience Software engineers that would like developing software and BSP for platforms based on Cortex-R5 processor. Prerequisites. Computer architecture background C and Assembler Experience in developing embedded systems Course Material ARM official course book ARM DS5 SDK
3 Agenda Main Topics: ARM Processor Cores ARM System Design Introduction to the ARM Architecture ISA Assembly Exception Handling Software Engineer s Guide to the Cortex-R5 Assembler Programming for ARM Processors Exception Handling ARM Caches and TCMs Using the MPU Synchronization Barriers C/C++ Compiler Hints & Tips Linker & Libraries Hints & Tips Programming the GIC Further Compiler/Linker Hints & Tips Embedded Software Development Cortex-R5 power management Debug and trace Day #1 Introduction to the ARM architecture Architecture Versions o Introduction to the ARM architecture o Development of the ARM architecture o ARM Cortex processors (A/R/M) Registers & Instruction Sets o Data sizes and instruction sets o The ARM register set o Program status register o ARM, Thumb. Thumb2, ThumbEE, Jazelle o Endianness o Assembler syntax examples o Floating point and NEON o AAPCS
4 Exception Model o Processor modes o Banking of registers o Taking an exception o Vector table Memory Model o Memory model overview o Memory types (Normal/Device/Strongly Ordered) o Memory hierarchy example o Data alignment Coprocessors o Coprocessors overview o CP15 example o PMU Architecture Extensions o TrustZone o Virtualization o Jazelle ARMv7-A/R ISA Overview ARM Assembler File Syntax Load/Store Instructions o Single/Double register data transfer o Addressing memory o Pre and post-indexed addressing o Multiple register data transfer Data Processing Instructions o Arithmetic, logical, move instructions o Shift/Rotate operations o The flexible second operand o Instructions for loading constants o Multiply/Divide o Bit manipulation instructions o Byte reversal Flow Control Instructions o Branch instructions o Interworking o Compare and branch if Zero o Condition codes and flags o If-Then instruction o Supervisor call instruction (SVC) Miscellaneous Instructions o Coprocessor instructions o PSR access o Breakpoint instruction (BKPT) o Wait for interrupt instruction (WFI)
5 o NOP instruction o Wait for event & send event instructions (WFE & SEV) DSP Instructions o SIMD o Saturated maths and CLZ o Data packing/unpacking Exception Handling in Details Introduction o Exception handling process o The ARM register set and modes o Exception priorities o Vector table o Link register adjustments o Returning from exceptions o Exception state & Endianness o Non-makable fast interrupt o Low latency interrupt Interrupts o Interrupt & interrupt handler example o Interrupt pre-emption o Issues with re-enabling interrupts o Change processor state (CPS) instruction o Stack issues o Nested interrupt example o FIQ vs IRQ o Interrupt controllers Abort Handlers o Prefetch and data aborts o Data abort types (internal/external, precise/imprecise) o Identifying the abort source o Example data abort handler SVC Handlers o What are SVC used for? o Example SVC handler o Example SVC usage in an OS Undef Handlers o Undefined instruction o Example Undef handler Reset Handlers ARM Tools Overview ARM Tools o ARM Compiler o Fast Models
6 o Versatile Express boards o DS5 Professional Edition o DSTREAM Debug & Trace Unit o Streamline analysis tool Cortex-R5 Architecture System Engineer s Guide to the Cortex-R5 o Cortex-R5 architecture overview o Cortex-R5 pipeline o Program flow prediction o Twin CPU support o Divide & floating point units o Level 1 memory system o Error detection and correction o Instruction set changes o Debug and trace support Day #2 Memory Structure ARMv7-R Caches and TCMs o Cache basics o Caches on ARM processors o L1 data cache policies o Inner and Outer cache policies o Write back and write through o L1 memory system buffers o Tightly Coupled Memory (TCM) o TCM configuration o ECC and parity schemes o Optimization considerations o Cache coherency operations o Cache core optimizations o Point of Unification (PoU) and Point of Coherency (PoC) Memory Protection Unit (MPU) Using the MPU o Why do we need memory management? o Access permissions o Memory types
7 o Types & attributes o Instruction accesses o Memory Protection Unit (MPU) overview o Protection regions o When the MPU is disabled Synchronization Techniques Synchronization o The need for atomicity o Critical sections o LDREX and STREX instructions o Multi-thread mutex example o Coherent and non-coherent multi-core o Synchronization in a cluster o Memory attributes o Context switching Using Barriers Understanding Barriers o Memory model and access order o Barriers overview o Data barriers o Speculation across barriers o Instruction barriers o Ordering of maintenance operations Debug Overview Debug o Types of debug o Invasive debug o Debug infrastructure and CoreSight overview o How do I access the debug logic? o Debug events o Halt vs. Monitor mode debugging o Viewing memory o Debugger impact on caches o Vector catch o Instruction breakpoint types o Embedded cross trigger- CTI o Debugger semi-hosting support o Non-invasive debug (PMU and trace) o Performance monitoring hardware o PMU configuration o Results analysis
8 o CoreSight trace system o Other trace resources Day #3 C/C++ Compiler Hints & Tips Writing C for ARM o Parameter passing Parameter passing Passing more than 4 parameters Parameter alignment o Floating point linkage HW and SW floating point linkage Floating point linkage example o Alignment Global data layout Unaligned accesses Packing and alignment of structures Alignment of pointers o Coding considerations Size of local variables Division Base pointer optimization Using volatile C/C++ Compiler Hints & Tips o Basic compilation Language support Variables types supported Optimization levels Selecting an architecture or processor o Compiler optimizations Automatic optimizations Tail-call optimization Instruction scheduling Idiom recognition Inlining of functions Loop transformation o Coding considerations Register usage Loop termination Division operations Reminders-Modulo arithmetic
9 C++ support o Local and global data issues Variable types Global data layout Optimization of memcpy() Linker & Libraries Hints & Tips Linker & Libraries Hints & Tips o Linking basics How does the linker know what to do? Object file structure Library structure Scatter-loading o System and user libraries Libraries versus object files Linker library searching Creating and maintaining libraries o Veneers and interworking Dealing with branches Linker generated veneers Veneer types Minimizing the number of veneers o Linker optimizations and diagnostics Unused section elimination RW data compression Small function inlining Useful linker diagnostics o ARM supplied libraries ARM compiler standard libraries Microlib o Mixing C/C++ and Assembler Register usage revisited Mixing C and Assembly Calling Assembly from C/C++ Intrinsics Embedded Assembler Inline Assembler o Stack issues Protecting and measuring stack usage --callgraph example (Dhrystone) o VFP Floating point capabilities Floating point linkage o Advanced building facilities Multifile compilation Linker feedback
10 Linking for specific target Debug issues & build time BPABI & SysV Embedded Software Development o Embedded development process o An out-of-the-box build Default C library Default memory map Application startup o Tailoring the C library to your target Retargeting the C library Avoiding C library Semihosting o Tailoring image memory map to your target Introduction to Scatterloading Scatter description files Linker placement rules Ordering objects in a Scatter file Root regions Run-time memory management Stack and Heap initialization Run-time memory models Stack and Heap regions o Reset and initialization The vector table Initialization steps Initialize stack pointers Local memory setup Extending functions Execute mode considerations o Further memory map considerations Long branch veneers Memory mapped registers o Building and debugging your image Unused section elimination/entry points Endianness Output options Debugging ROM images o Placing stack and heap in scatter file o ROM/RAM remapping Generic Interrupt Controller Programming GIC Overview o GIC architecture o Sources of interrupt (SGI, PPI, SPI) Distributor and CPU Interfaces
11 o Register interfaces o Distributor interface o CPU interface o Programming guidelines How to Enable and Configure Interrupts o Enabling the IC o Interrupt configuration How to Handle Interrupts o Interrupt states o Taking an interrupt o Which CPU services an SPI? o Priority mask register o Interrupt priority registers o Pre-emption o Nesting interrupts How to Send Software Interrupts o SGI capability o Sending a SGI o Receiving a SGI Security Extensions o Group 0 and Group 1 o Acknowledging interrupts o Priority and banking Interrupts IDs on Cortex-R4 Software Power Management for Cortex-R5 Cortex-R4 Power Management o Processor power consumption Power components Example power contributions Power reduction o Power modes Standby mode Shutdown mode Dormant mode o Use cases o SoC power modes o Entering low power modes o Exiting shutdown/dormant mode
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